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by pmisteli 25 Sep '04

25 Sep '04

Why is audio-jaguar in madplay not finished ? Has anyone finished it ?

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Re: [mad-dev] Cross complilation/running minimad
by Emil Rojas 24 Sep '04

24 Sep '04

Ok, I was able to execute the actual code, but I the output is not correct. Here is what I did cat ~/data/audio/bfire-w2m.mp2 ./minimad > x.pcm I then encapsulate the PCM as a wave file with a program I wrote, and produced the file x-mni.wav and I also did on the development linux machine. ./madplay --output=wave:x.-mp86.wav ~/data/audio/bfire-w2m.mp2 You can see that file size is different here: -rw-r--r-- 1 erojas users 37528 Sep 24 13:33 x-mini.wav -rw-r--r-- 1 erojas users 16172 Sep 24 13:36 x-mp86.wav When I play these files on a PC using winamp the madplay produced file is correct, and the minimad produced file is white noisy. Any ideas? Endianess? Number of bits per sample? It does output PCM? -------------------- Re: building madplay for the target, I'm having a devil of a time. Because I need to first install both the MAD library and tags library. But I can get the tags library to figure because it needs zlib. I have tried installing zlib, and I believe this has been done correctly, but the configure for the tags lib can not find it. I think this is because it is not telling the compiler to look in the right place, but I'm not really sure. Re: script problem: The problem my be that I am installing the code in a directory that is later mounted as the root of the STB that I am developing for. I tried removing that part of the path in the one place it appeared and then executing it on the target but I still had the same error. thanks, emil At 02:30 PM 9/23/2004, Rob Leslie wrote: >On Sep 23, 2004, at 2:22 PM, Emil Rojas wrote: >> Hmm, I still get this stuff when I try to run minimad, do have any idea >> what would cause that? I will make madplay and try it also. > >I think it is probably because the minimad "executable" that is built is >really only a shell script that invokes the real executable after first >arranging to locate the correct shared libraries in the build environment >(as they may not be installed yet). > >The real executable lives in the .libs subdirectory. > >-- >Rob Leslie >rob(a)mars.org >

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MMAP in minimad
by Emil Rojas 23 Sep '04

23 Sep '04

I have compiled by madplay and minimad. Madpaly appears to work corrrectly, but minimad fails at the mmap() call. And clues? emil

2 1

Cross complilation
by Emil Rojas 23 Sep '04

23 Sep '04

The MAD code drop does not appear to be set up for cross compilation. I have tried to modify the makefile and libtool script to used tools with CROSS_COMPILE prepended. The code, madlib and minimad compile but when I try to run minimad I get the output below and I have no idea what it means. I have been able to compile and run madpaly for my development platform, an X86 linux PC. Any help greatly appreciated. If you can CC me in any reply I would appreciate that also. ------------------ minimad sed_quote_subst=s/$[\\`\\"$\\\\]$/\\\1/g: not found relink_command=(cd /home/erojas/src/shell/madplay/madlib-xilleon; { test -z "${LIBRARY_PATH+set}" || unset LIBRARY_PATH || { LIBRARY_PATH=; export LIBRARY_PATH; }; }; { test -z "${COMPILER_PATH+set}" || unset COMPILER_PATH || { COMPILER_PATH=; export COMPILER_PATH; }; }; { test -z "${GCC_EXEC_PREFIX+set}" || unset GCC_EXEC_PREFIX || { GCC_EXEC_PREFIX=; export GCC_EXEC_PREFIX; }; }; { test -z "${LD_RUN_PATH+set}" || unset LD_RUN_PATH || { LD_RUN_PATH=; export LD_RUN_PATH; }; }; PATH=".:/home/erojas/bin:/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/usr/tools/bin:/sbin:/usr/sbin:/home/erojas/bin"; export PATH; /usr/tools/bin/mipsel-linux-gcc -o $progdir/$file minimad.o ./.libs/libmad.so -Wl,--rpath -Wl,/home/erojas/src/shell/madplay/madlib-xilleon/.libs -Wl,--rpath -Wl,/usr/local/lib): not found 192: SIGSEGV sed_quote_subst=s/$[\\`\\"$\\\\]$/\\\1/g: not found relink_command=(cd /home/erojas/src/shell/madplay/madlib-xilleon; { test -z "${LIBRARY_PATH+set}" || unset LIBRARY_PATH || { LIBRARY_PATH=; export LIBRARY_PATH; }; }; { test -z "${COMPILER_PATH+set}" || unset COMPILER_PATH || { COMPILER_PATH=; export COMPILER_PATH; }; }; { test -z "${GCC_EXEC_PREFIX+set}" || unset GCC_EXEC_PREFIX || { GCC_EXEC_PREFIX=; export GCC_EXEC_PREFIX; }; }; { test -z "${LD_RUN_PATH+set}" || unset LD_RUN_PATH || { LD_RUN_PATH=; export LD_RUN_PATH; }; }; PATH=".:/home/erojas/bin:/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/usr/tools/bin:/sbin:/usr/sbin:/home/erojas/bin"; export PATH; /usr/tools/bin/mipsel-linux-gcc -o $progdir/$file minimad.o ./.libs/libmad.so -Wl,--rpath -Wl,/home/erojas/src/shell/madplay/madlib-xilleon/.libs -Wl,--rpath -Wl,/usr/local/lib): not found 215: SIGSEGV relink_command_output=: not found _command_output [erojas@ati-stw madlib-xilleon]$ minimad sed_quote_subst=s/$[\\`\\"$\\\\]$/\\\1/g: not found relink_command=: not found 229: SIGSEGV sed_quote_subst=s/$[\\`\\"$\\\\]$/\\\1/g: not found relink_command=: not found 252: SIGSEGV relink_command_output=: not found _command_output

2 1

question about standart
by Grigory A. 22 Sep '04

22 Sep '04

Hello! Could someone give me answer : are mp3 frames independent? I mean how current frame depend from previous? It looks like points of dependences are in - overlap procedure - synthesis procedure so if I skip correctly one or more frames - all "problems" will disappear after first newly decoded frame. I mean - first frame decoded after skipped - will be wrong (if compare with non-skipped sequence)and second become same in both cases? Thanks for answers. -- Best regards, Grigory mailto:Ryhor@tut.by

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Re: [mad-user] How to manipulate both V1 and V2 tags in the same file
by Cedric Tefft 22 Sep '04

22 Sep '04

Rob Leslie wrote: > The file API of libid3tag presents a single view of all the tags > contained in a file, and does not differentiate between V1 and V2 > tags. The idea is that V1 and V2 tags should represent the same > information about a file, and if both are present then V2 information > is preferred because its field lengths are not constrained as in V1. > (When writing tags back to a file, the intent is that the file > interface will generate both V1 and V2 tags from the same source, > ensuring consistency.) This is certainly a sensible strategy. To that end, I think it would be useful to allow the application to determine what the V1 equivalent of the V2 information is. Sometimes it is possible to create a better V1 equivalent of a V2 tag by abbreviating certain words or phrases. For example, if the V2 title is something like "While the Earth Sleeps (Pet Shop Boys Remix)", the truncated version is "While the Earth Sleeps (Pet Sh", whereas a more informative alternative is "While the Earth Sleeps (PSB)". Obviously, it's beyond the scope of libid3tag to be able to generate abbreviations for this method. They should be handled by the application. But in order to do that, however, the library would have to allow the application to override what it considers to be the equivalent V1 tag, or to put it more simply, the application would have to be allowed to set the V2 and V1 tags independantly of each other. > > Accordingly, it's not possible to access the V1 and V2 information as > separate tags with the file interface. If you really want to do this, > you can use the tag parsing and rendering routines to maintain > separate tag structures and data, but you'll have to read and write > the data from the file yourself. > I'm preared to do this if necessary, however it occurs to me that what I'll end up doing is rewriting, almost verbatim, functions that already exist in libid3tag (new_file() and the like). The only reason I couldn't use the library functions is that they aren't exported to the API. This seems like a bit of a waste since I have to link to the library anyway. Would you be willing to accept a few patches which expose a bit more of the library's internals to the API? - Cedric

3 6

About mad_stream_skip
by Francis Labonte 21 Sep '04

21 Sep '04

Hi, I have a question about mad_stream_skip. If I call this function, would if be correct to call mad_stream_sync after? Actually, mad_stream_skip does'nt care about the skip offset (well, I think...). I would expect that if I call sync after skip, It will try to sync starting from the new position (position + skip offset). If I do that, it does'nt work since the "skip offset" will be consider only at the next decode_frame call. I'me new to mad's API so I would appraciate if somebody could explain me the logic behind that please. Thank you Francis _________________________________________________________________ Take advantage of powerful junk e-mail filters built on patented Microsoft® SmartScreen Technology. http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=ht… Start enjoying all the benefits of MSN® Premium right now and get the first two months FREE*.

2 1

mp3gain vs madplay
by Bruce Fitzsimons 15 Sep '04

15 Sep '04

Peoples, I'm about to launch into a debugging session to see why mp3gain (http://mp3gain.sourceforge.net/ ) and madplay 0.15.1b don't seem to be playing together (no pun intended). I thought I'd ask if anyone has used the two together yet, or if there is another linux-based replaygain processor (for adding replaygain to existing mp3s) that is more reliable. map3gain does appear to be adding a tag, as it finds it again if rerun over the same file. "# mp3gain /tmp/Abracadabra.mp3 /tmp/Abracadabra.mp3 Recommended "Track" dB change: -1.690000 Recommended "Track" mp3 gain change: -1 Max PCM sample at current gain: 28533.063680 Max mp3 global gain field: 180 Min mp3 global gain field: 116 Recommended "Album" dB change for all files: -7.490000 Recommended "Album" mp3 gain change for all files: -5" madplay doesn't appear to find it: "# madplay -G -Tv /tmp/Abracadabra.mp3 MPEG Audio Decoder 0.15.1 (beta) - Copyright (C) 2000-2004 Robert Leslie et al. Title: Abracadabra Artist: The Steve Miller Band Album: Golds Greatest Hits Track: 11 Year: 1982 Genre: Vocal Encoder Version: LAME 3.92 VBR Method: constant Bitrate: 255+ kbps Stereo Mode: normal Preset: none Unwise Settings: no Encoding Flags: Lowpass Filter: 19500 Hz ATH Type: 2 Noise Shaping: 1 Surround: none Start Delay: 576 samples End Padding: 1503 samples Source Rate: 44.1 kHz Music Length: 9948263 bytes Audio Frames: 11900" (note the missing "Replay Gain" printout I expect after reading the source) I'd hasten to add that I suspect mp3gain of doing something wrong, not madplay. I'm guessing the tag is wrong or in the wrong place. Any info would be appreciated, otherwise I'll report my findings to the list when I discover the root cause. /Bruce

5 8

Creating samples display like Wavelab eg.
by Sickboy 08 Sep '04

08 Sep '04

Hi guys, i could need help in understanding displaying decoded mp3. I decode the mp3 by the minimad example which works fine. for (int i=0; i<(nsamples*4); i+=4) { sample = scale(*left_ch++); *redux++ = (sample >> 0) & 0xff; *redux++ = (sample >> 8) & 0xff; if (nchannels == 2) { sample = scale(*right_ch++); *redux++ = (sample >> 0) & 0xff; *redux++ = (sample >> 8) & 0xff; } } After that i got an unsigned char array which is in the little endian format. Looks like this if i got an stereo file: Left 1st byte, Left 2nd byte, Right 1st byte, Right 2nd byte, Left 1st byte, Left 2nd byte, .... Please correct me if i'm wrong. Now i try to display these datas in a waveform like in Wavelab, Soundforge, Audacity It would be great if anyone could tell me how to calculate the peaks which i have to draw. Thanks you daSickboy

1 0

MAD and Jack (originally posted to the wrong list)
by andrew＠fnarg.demon.co.uk 07 Sep '04

07 Sep '04

Hi there, I'm writing a playout system which utilises Jack and MAD to play MP3 files. I've written a simple app which under libao (I was using this prior to Jack) will happily play any MP3 file I throw at it. However, upon adding the relevant code to make it a Jack client I've run across a problem. MAD seems to output audio at either 24bit fixed point or 16bit signed whereas Jack expects audio in 32bit floating point. Is there an easy way to make this work, am I being thick? Please help! Cheers, Andy M

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